Hypodermic and similar syringe.



J. A. ROWSE. HYPODERMIG AND SIMILAR SYRINGE, APPLIOATION FILED AUG. 10. 1911.

1,015,276. Patented Jan. 16, 1912.

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UNITE sTATEs PATENT onFIoE. i Jenn AMBROSE nowsn, oFNEWQUnY, ENGLAND, Assisnon fro irrrn i i FAoT UnINo COMPANY, LIMITED, OF"I;O 1\TDON, EN/GLAND.

HYPODERMIG nnn S MILAR sYnInGE."

To all whom it may concern:

Be it known that I, JOHN AMBROSE Rowsn, a subject of the King of Great Britain, residing at Lisbon'House, Newquay, i n'the county of Cornwall, England, have invented certain new and useful Improvements in I-Iypodermic and Similar Syringes, ofwhich the following is a specification. 5 a This invention "relates to syringes'of; thekind that are us'edfor locally injectingan anesthetic or other liquid into a patient;

The invention is particularly applicable to the anesthetic syringesthat are used by dentists, which as -at present constructed comprise a barrel having atone end a fneedle-nozzle and containing a plunger :the' spindle of which projects through the opposite end of the barrel and terminates inian actuating handle. In charging thesyringe with the anesthetic in the ordinary manner it is necessary for the needle-nozzleiito be removed and when the syringe isin constant use the needle-nozzle may have to be re moved many times during the day, and each time it is removed it is laid on the table, marble slab, glass stand or elsewhere while the refilling is being effected. The points of the needleand nozzle are thus rendered very liable to come into contact with substances Which for septicreasons should be avoided.

According to this invention *the syringe is charged without the necessityof, removing the needle-nozzle. For this purpose. the said means may comprise a tubelconnected with a plug or valve that is interposed between the barrel ofthe syringe and the nee die-nozzle for putting the barrel into or out of communication with the needlern'ozzle or with the aforesaid tube which is adapted to be inserted into a'via'l" or the'like containing the anesthetic.

In order that the said invention maybe a clearly understood and readily'carried "into eiiect, I will describe the same more fully with reference to the accompanying draw ings, in which I Specification of Letters Patent:

I Figure 1 is a plan of part of a syringe constructed in accordance with this invention. Fig.2 1s a vertical section of Fig. 1 Fig. 3

n'nn'rAnM n-n- V I PatentedJa1i. 16','1912. Application filed August'm, 1911. s riai Hosan a] v u i r is a transverse section taken on the 'line- 3, 3',

ofFig. -1 ,.and"Fig. 4: is a detached sectional viewof the plug taken'atright angles to that shown in Fig. 3'. Y 1

A represents the barrel of the syringe, B

the needle-nozzle, G the plug or valve anao the tube that is connected therewith. "In the example shown'the tube'C constitutesthe operating handle of the plug or valve c.

The latter is detachable to permit of its removal for cleaning and sterilizing purposes 1 andis formed with two passages 0/0" which open into the peripheral portion of -theplug in a plane passing throughthe aperture-of the'needlenozzle. The passages o 0" are so arranged that when the tube C .occupiesa transverse position in relation torthegbarrel as shown in Figs. land 3, a free passage for the anesthetic is provided between the -needle-nozzle aperture the barrel for jenabling theilatter' to be charged with the. anesthetic. 1 When the tube G lies parallel to, or approximatelyparallel 'to the'barrel (Fig. 2), a' free passage from the barrel to thence dle nozjzle exists for enabling the anesthetic; to be forced from the barrel into the patient.

What I claim and desire; to secure.byLe.t

; ters Patent of the United, States is provided with means whereby it can be re:

dle..nozzle7on the end of the said barrel, a

valve plug between the nozzle and thebar;

relandi a tubular operating handlefor'the l said. plugwforming av continuation of rapas sage in the plug adapt ed' to be placed-intojor out'of communicationwith the barrel, whereby the" barrel is charged with fluid through the said handle independently of the nozzle.

7 In testimony whereof Iaffix mysignature.

in presence. of two witnesses;

, 7 JOHN AMBRQ E Witnesses: H 1 g I PATGI-IING,

h T.'S ELBY WVORDLE.

Copies of this patent may be obtained z for five'cents each, addressing the Commissioner of Patents, f Washington, D. GR, i 1 p 

